soc/intel/skylake: Move `SataTestMode` to Kconfig

This option is not mainboard-specific, and should be user-visible.

Change-Id: I9ff2ca984cd238a112af4efd7685f142cc6e5459
Signed-off-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52099
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Michael Niewöhner <foss@mniewoehner.de>
diff --git a/src/soc/intel/skylake/chip.c b/src/soc/intel/skylake/chip.c
index d4d8938..d4e8341 100644
--- a/src/soc/intel/skylake/chip.c
+++ b/src/soc/intel/skylake/chip.c
@@ -304,7 +304,7 @@
 		 * write" errors and others. Enabling this option solves these problems.
 		 */
 		params->SataPwrOptEnable = 1;
-		tconfig->SataTestMode = config->SataTestMode;
+		tconfig->SataTestMode = CONFIG(ENABLE_SATA_TEST_MODE);
 	}
 
 	memcpy(params->PcieRpClkReqSupport, config->PcieRpClkReqSupport,